It's very popular in rural US where running wired broadband is cost prohibitive.
There are many parts of the US that are very spread out, and thus running wires to every home is expensive without subsidies.
Right the areas that companies took money to roll out high speed internet to, then just kept the money and called DSL high speed or just did nothing. The government should keep giving companies money and investing in them. It's brilliant.
Exactly. Central Europe is one of the most densely populated regions on the planet outside of Asia. High population density makes fiber more economical, and low population density, the inverse. As other la have pointed out, India actually has very deep fiber penetration exactly for this reason. The Americas, by contrast, are largely devoid of people which makes the economics of any networking infrastructure harder